I run a high output alternator, and the larger pulley on the bottom spins it faster. So a benefit for that accessory as my high output alternators has to spin faster to work. It also spins the A/C compressor faster, so A/C is better at idle too.

It spins the water pump and P/S Pump faster, which doesn't do any good, just waste more power.

"not good" or "good" is relative to what you're doing.

That said, it's a TINY difference, like, a few% different/you'll never notice anyways.

So I got the ATI damper from fab9... How important is the belt guide? FM and ATI seem to think it's required, haven't heard back from fab9 yet. Who here runs it or not?

ATI engineered and designed the part. It was zero balanced with all of the parts at one point. It is necessary not only to keep the timing belt from destroying itself but to assure the pullie is balanced and that it will reduce vibrations and not create them.

Fab9 is just a retail store for the product.

Agreed. Why would you ignore something from the manufacturer because a reseller said something.

Well it's not like the manufacturer slipped in a note or anything telling me about it. You have to go to their site and find it. I stumbled across the whole belt guide thing entirely by accident while googling for something else.

edit: talked to Fab9, ATI normally puts the belt guide in the box but apparently they forgot this time. He's sending me one now. Kickass.

I was in the middle of installing my ATI damper from Fab9 and I had a feeling that something was missing. Turns out I'm missing the belt guide, key, and the new crank bolt. I'm glad I saw your quote, I'll give them a call Monday.

I'm going to jump out on a limb here and say that I suspect that fab9 sells open box return items. The Skunk2 throttle body that I received was not in the original packaging and I have heard that this is the case for everyone else that I have talked to. Things apparently arrive sometimes with missing components and odd abnormalities in the packaging.

Lube the shaft and it will slip right on they said.
It's fully assembled, it will be fun and easy they said.
Emilio is out of stock, buying an ATI will save time they said.

Fast forward one three weeks, and I've installed the super damper, bought a damper puller, uninstalled the damper to put on the belt guide.... And just discovered that I have to disassemble the whole thing to get it on because the timing belt sprocket is bigger than the internal diameter of the belt guide.

Project 90% done, 90% to go.

Edit, nevermind, the little ring on the end is apparently a press fit being retained by a tiny roll pin. This means I don't have to take it apart but it means that it better be pressed up against the crank or it can fall right off. It's not even staked in place or anything.

Update: everything back on the engine, it was surprisingly easy. Except for the part where one of my arms is holding the flywheel in place with a breaker bar and the other arm is trying to gently apply 120ft-lbs of torque to the crank bolt.